<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <style>
        h1{
            color:red;
            text-align: center;
        }
        div {
            border: 2px solid red; 
            padding: 10px; 
            margin: 20px; 
        }
        #introduce{
            color: aquamarine;
        }
        a:hover{
            color: blue;
        }
    </style>
    <h1>Hello World</h1>
    <div id="introduce">我是煎蛋大王</div>
    <a href="#">了解详情</a>
</body>
</html>